Hemorrhagic arthritis is a common forms of arthritis. Like other types of arthritis, the material that cushions the joints, called cartilage, breaks down. This causes the bones to rub against each other which in turn causes a lot of swelling in the joints resulting in stiffness and inflammation. In hemorrhagic arthritis, the joint inflammation may result from autoimmune disease (meaning your body’s immune system, which usually protects your health by attacking foreign substances such as bacteria and viruses, mistakenly attacks your joints), broken bone, general wear and tear on joints, and infection usually due to a virus or bacteria. The main cause of hemorrhagic arthritis is trauma, that is an injury, lesion or cut to a joint. The most commonly affected area is the knee. Individuals affected by sickle cell disease, hemophila A and hemophilia B have a higher rist of developing hemorrhagic arthritis. Hemorrhagic arthritis may be found in both men and women. Therapy for hemorrhagic arthritis exists and is somewhat dependent on the cause.